Pretending to be in need to borrow large sums of money from close friends, but not pay back. Excuses such as "man, I don't even have money to eat right now but ill pay you back next week for sure" or "oh, i didn't get your message", and "don't worry man I'm selling my car to pay you back" only to leave the country for vacation whilst posting lavish dinning photos on Instagram.

Not so much exaggerating the truth but to bare face lie about random things such as owning many properties, secretly being a millionaire, used to be a professional football player, being popular with the opposite sex.
Normally ‘Clementing’ is done by someone who should know better like a parent showing off to a child, a teacher in front of a class or a work colleague trying to big themselves up
Otherwise know as being a ‘Walter Mitty’. Someone who lives in a constant fantasy state.

John - "Neil's Clementing again'
Paul - 'what's he done?'
John ' Told everyone he just sold 2 flats yesterday for a profit of $50k each as well as having an orgy with the neighbours wife and daughter'!
Paul ' Gee's, the guy's in his 40's, why does he BS so much!